AMMA-CATCH, a critical zone observatory in West Africa monitoring a megion in transition

Sylvie Galle; Manuela Grippa; I. Bouzou Moussa; B. Cappelaere; J. Demarty; Éric Mougin; G. Panthou; P. Adjomayi; A. Bâ; M. Boucher; J- Cohard; Marc Descloitres; Luc Descroix; Malam Abdou; Oumarou Malam-Issa; E. Agbossou; M. Cohard; B. Sambou; J-M Vouillamoz; J-P Chazarin; A. Mamane; C. Peugeot; M. Diawara; M. Dossou; G. Favreau; F. Gangneron; M. Gosset; B. Hector; Pierre Hiernaux; B. Issoufou; L. Kergoat; E. Lawin; T. Lebel; A. Legchenko; O. Malam-Issa; O. Mamadou; Y. Nazoumou; T. Pellarin; G. Quantin; Josiane Seghieri; L. Seguis; J. Vandervaere; T. Vischel; M. Vouillamoz; A. Zannou; S. Afouda; A. Alhassane; M. Arjounin; H. Ba; R. Biron; F. Cazenave; V. Chaffard; H. Guyard; A. Koné; I. Mainassara; M. Oi; T. Ouani; N. Soumaguel; M. Wubda; E. Ago; C. Alle; A. Allies; F. Arpin-Pont; B. Awessou; C. Cassé; G. Charvet; C. Dardel; A. Depeyre; B. Diallo; T. Do; C. Fatras; Frédéric Frappart; L. Gal; T. Gascon; F. Gibon; I. Guiro; A. Ingatan; Jean Kempf; O. Kotchoni; M. Lawson; Crystèle Léauthaud; S. Louvet; E. Mason; C. Nguyen; B. Perrimond; C. Pierre; A. Richard; E. Robert; C. Román-Cascón; C. Velluet; C. Wilcox

doi:10.2136/vzj2018.03.0062

Journal articles

AMMA-CATCH, a critical zone observatory in West Africa monitoring a megion in transition

Sylvie Galle ¹ Manuela Grippa ² I. Bouzou Moussa ³ B. Cappelaere ⁴ J. Demarty ⁴ Éric Mougin ⁵ G. Panthou ¹ P. Adjomayi ⁶ A. Bâ ⁷ M. Boucher ¹ J- Cohard ¹ Marc Descloitres ¹ Luc Descroix ⁸ Malam Abdou ⁹ Oumarou Malam-Issa ¹⁰ E. Agbossou ¹¹ M. Cohard ¹² B. Sambou ¹³ J-M Vouillamoz ¹² J-P Chazarin ⁴ A. Mamane ¹⁰ C. Peugeot ⁴ M. Diawara ¹⁴ M. Dossou ⁶ G. Favreau ⁴ F. Gangneron ¹⁵ M. Gosset ¹ B. Hector ¹ Pierre Hiernaux ¹⁶ B. Issoufou ¹⁷ L. Kergoat ¹⁸ E. Lawin ¹¹ T. Lebel ¹⁹ A. Legchenko ¹ O. Malam-Issa ¹⁰ O. Mamadou ¹¹ Y. Nazoumou ³ T. Pellarin ¹ G. Quantin ¹² Josiane Seghieri ⁴ L. Seguis ⁴ J. Vandervaere ¹ T. Vischel ¹ M. Vouillamoz ¹ A. Zannou ⁶ S. Afouda ¹ A. Alhassane ¹ M. Arjounin ¹ H. Ba ¹⁴ R. Biron ¹ F. Cazenave ¹ V. Chaffard ¹⁴ H. Guyard ¹ A. Koné ¹ I. Mainassara ⁴ M. Oi ⁴ T. Ouani ¹ N. Soumaguel ²⁰ M. Wubda ¹ E. Ago ¹¹ C. Alle ^{1, 11} A. Allies ⁴ F. Arpin-Pont ⁴ B. Awessou ^{4, 11} C. Cassé ² G. Charvet ⁴ C. Dardel ² A. Depeyre ¹ B. Diallo ²¹ T. Do ²² C. Fatras ² Frédéric Frappart ⁵ L. Gal ²³ T. Gascon ¹ F. Gibon ²⁴ I. Guiro ¹³ A. Ingatan ¹ Jean Kempf ¹ O. Kotchoni ¹ M. Lawson ¹ Crystèle Léauthaud ²⁵ S. Louvet ¹ E. Mason ¹ C. Nguyen ²⁶ B. Perrimond ¹ C. Pierre ² A. Richard E. Robert ² C. Román-Cascón ¹ C. Velluet ⁴ C. Wilcox ¹

1 IGE - Institut des Géosciences de l’Environnement

2 GET - Géosciences Environnement Toulouse

3 Université Abdou Moumouni [Niamey]

4 HSM - Hydrosciences Montpellier

5 CESBIO - Centre d'études spatiales de la biosphère

6 DGEau - Direction Générale de l'Eau [Bénin]

7 Université des sciences, des techniques et des technologies de Bamako

8 PALOC - Patrimoines Locaux et Gouvernance

9 Université de Zinder - University of Zinder [Zinder, Niger]

10 IRD Représentation du Niger

11 UAC - Université d’Abomey-Calavi

12 IGE - Institut des Géosciences de l’Environnement

13 UCAD - Université Cheikh Anta Diop [Dakar, Sénégal]

14 USTTB - Université des sciences, des techniques et des technologies de Bamako

15 LA - Laboratoire d'aérologie

16 LMTG - Laboratoire des Mécanismes et Transfert en Géologie

17 UDDM - Université Dan Dicko Dan koulodo de Maradi

18 INS - Institut de Neurosciences des Systèmes

19 IRD - Institut de Recherche pour le Développement

20 IRD [Guinée] - Institut de Recherche pour le Développement

21 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)

22 UCLA - University of California [Los Angeles]

23 IBCP - Institut de biologie et chimie des protéines [Lyon]

24 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques

25 UMR LISAH - Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème

26 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

Abstract : West Africa is a region in fast transition from climate, demography, and land use perspectives. In this context, the African Monsoon Multidisciplinary Analysis (AMMA)-Couplage de l'Atmosphere Tropicale et du Cycle eco-Hydrologique (CATCH) long-term regional observatory was developed to monitor the impacts of global change on the critical zone of West Africa and to better understand its current and future dynamics. The observatory is organized into three thematic axes, which drive the observation and instrumentation strategy: (i) analyze the long-term evolution of eco-hydrosystems from a regional perspective; (ii) better understand critical zone processes and their variability; and (iii) meet socioeconomic and development needs. To achieve these goals, the observatory has gathered data since 1990 from four densely instrumented mesoscale sites (similar to 10(4) km(2) each), located at different latitudes (Benin, Niger, Mali, and Senegal) so as to sample the sharp eco-climatic gradient that is characteristic of the region. Simultaneous monitoring of the vegetation cover and of various components of the water balance at these four sites has provided new insights into the seemingly paradoxical eco-hydrological changes observed in the Sahel during the last decades: groundwater recharge and/ or runoff intensification despite rainfall deficit and subsequent re-greening with still increasing runoff. Hydrological processes and the role of certain key landscape features are highlighted, as well as the importance of an appropriate description of soil and subsoil characteristics. Applications of these scientific results for sustainable development issues are proposed. Finally, detecting and attributing eco-hydrological changes and identifying possible regime shifts in the hydrologic cycle are the next challenges that need to be faced.

Keywords : CLIMATE-CHANGE LAND-SURFACE HARD-ROCK AQUIFERS WATER STORAGE CHANGES GROSS PRIMARY PRODUCTION MONSOON MULTIDISCIPLINARY ANALYSIS

Document type :

Journal articles

Domain :

Sciences of the Universe [physics]

Sciences of the Universe [physics] / Continental interfaces, environment

Sciences of the Universe [physics] / Earth Sciences

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https://hal.ird.fr/ird-02153117
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Last modification on : Wednesday, November 17, 2021 - 12:33:27 PM

AMMA-CATCH, a critical zone observatory in West Africa monitoring a megion in transition

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